Insurance Recoveries On Impairment And Related Losses Due To Earthquake (Schedule Of Net Impact In Current Earnings) (Details) $ in Thousands		12 Months Ended						24 Months Ended
		Dec. 31, 2017 NZD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 NZD ($)		Dec. 31, 2016 USD ($)		Dec. 31, 2017 USD ($)
Insurance Recoveries [Line Items]
Insurance Proceed Allocation		$ 36,034		$ 36,034
Total expected incurred losses, November 30, 2016				22,746
Less: Casualty Losses recorded in 2016 Earnings				$ (2,019)	[1]	$ (1,421,000)
Recoverable Assets, December 31, 2016	[2]					$ 20,727,000
Add: Upward changes in estimates and others			$ 458,000
Net recoverable balances charged against proceeds			21,185,000
Casualty gain, recorded in 2017 Earnings		14,849	10,740,000
Net Casualty gain for 2016 and 2017 Earnings								$ 9,319,000
Deductible from casualty loss				5.00%		5.00%
Gain on insurance recoveries		12,700	9,217,000			$ (1,421,000)	[3]
Non-Operating Income [Member]
Insurance Recoveries [Line Items]
Insurance Proceed Allocation				$ 33,817
Total expected incurred losses, November 30, 2016				22,746
Less: Casualty Losses recorded in 2016 Earnings				(2,019)	[1]	(1,421,000)
Recoverable Assets, December 31, 2016	[2]					20,727,000
Add: Upward changes in estimates and others			347,000
Net recoverable balances charged against proceeds			21,074,000
Casualty gain, recorded in 2017 Earnings		12,743	9,217,000
Net Casualty gain for 2016 and 2017 Earnings								7,796,000
Property Damage [Member]
Insurance Recoveries [Line Items]
Insurance Proceed Allocation		29,093
Property Damage [Member] | Non-Operating Income [Member]
Insurance Recoveries [Line Items]
Insurance Proceed Allocation	[4]			29,093
Total expected incurred losses, November 30, 2016	[4]			14,246
Less: Casualty Losses recorded in 2016 Earnings	[4]			(795)	[1]	(560,000)
Recoverable Assets, December 31, 2016	[2],[4]					13,451,000
Add: Upward changes in estimates and others	[4]		347,000
Net recoverable balances charged against proceeds	[4]		13,798,000
Casualty gain, recorded in 2017 Earnings	[4]	15,295	11,063,000
Net Casualty gain for 2016 and 2017 Earnings	[4]							10,503,000
Demolition Costs [Member]
Insurance Recoveries [Line Items]
Insurance Proceed Allocation		4,724
Casualty loss considered as income				1,200		862,000
Demolition Costs [Member] | Non-Operating Income [Member]
Insurance Recoveries [Line Items]
Insurance Proceed Allocation	[4]			4,724
Total expected incurred losses, November 30, 2016	[4]			8,500
Less: Casualty Losses recorded in 2016 Earnings	[4]			(1,224)	[1]	(861,000)
Recoverable Assets, December 31, 2016	[2],[4]					$ 7,276,000
Net recoverable balances charged against proceeds	[4]		7,276,000
Casualty gain, recorded in 2017 Earnings	[4]	(2,552)	(1,846,000)
Net Casualty gain for 2016 and 2017 Earnings	[4]							(2,707,000)
Business Interruption [Member]
Insurance Recoveries [Line Items]
Insurance Proceed Allocation		2,217
Business Interruption [Member] | Operating Income [Member]
Insurance Recoveries [Line Items]
Insurance Proceed Allocation	[5]			$ 2,217
Add: Upward changes in estimates and others	[5]		111,000
Net recoverable balances charged against proceeds	[5]		111,000
Casualty gain, recorded in 2017 Earnings	[5]	$ 2,106	$ 1,523,000
Net Casualty gain for 2016 and 2017 Earnings	[5]							$ 1,523,000

[1] The casualty losses recorded in 2016 as a separate line in our Consolidated Statement of Operations is made up the following: (i) 5% deductible of $795,000 (NZ$560,000) calculated based on the estimated value of the insured damaged parking structure for insurance purposes, and (ii) $862,000 (NZ$1.2 million) of total estimated demolition costs was preliminarily assessed as expenses not reimbursable under our insurance policy and hence, we recorded in profit and loss.

[2] The recoverable asset of $9.5 million (NZ$13.6 million), net of advance payment of $5.0 million (NZ$7.1 million), as of December 31, 2016 was presented as part of "Other non-current assets" as the timing of the insurance claim receipt was not fixed nor reliably determinable as of the time of our initial assessment.

[3] Certain prior year balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).

[4] The net impact to 2017 earnings of $9.2 million (NZ$12.7 million) is recorded as "Casualty gain" in our Consolidated Statement of Operations.

[5] The impact to 2017 operating earnings of $1.5 million (NZ$2.1 million) is recorded as part of the applicable segment revenues in our Consolidated Statement of Operations.